DOUGLAS K REX M.D.
NPI 1164486643
Internal Medicine - Gastroenterology in Indianapolis, IN

Q: What is Douglas Rex's NPI number?

The NPI number for Douglas Rex is 1164486643. It was assigned to this individual provider in the NPPES registry on April 13, 2006.

Q: What is Douglas Rex's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Q: When was this NPI record last updated?

The NPPES record for Douglas Rex was last updated on March 4, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since April 13, 2006PECOS EnrolledAccepts Medicare Assignment

550 UNIVERSITY BLVD, UH 4100, INDIANAPOLIS, IN 46202(317) 278-8741 Get Directions Write a Review

NPPES record last updated: March 4, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Mar 4, 2025, Dec 29, 2020 (2 updates tracked since 2020).

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About Douglas K Rex M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DOUGLAS K REX M.D. (NPI 1164486643) is an individual gastroenterology provider in Indianapolis, Indiana, licensed in Indiana (01029838A) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, is affiliated with Indiana University Health, and is a graduate of Indiana University School Of Medicine (1980).

NPPES Registry Identity

NPI1164486643

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameDOUGLAS K REXCredential: M.D.

Location Address550 UNIVERSITY BLVD, UH 4100Indianapolis, IN 46202-5149

Mailing Address250 N Shadeland AveIndianapolis, IN 46219-4959

Phone(317) 278-8741

Sole ProprietorNo

Medical School CMSIndiana University School Of MedicineGraduated 1980

Enumeration DateApril 13, 2006

Last NPPES UpdateMarch 4, 20252 updates tracked since enumeration

NPPES CertifiedMarch 4, 2025

✔ NPI 1164486643 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

License✔ Licensed in IN · 01029838A

Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

550 UNIVERSITY BLVD, Indianapolis, IN 46202

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Other Identifiers 1

Medicaid100239400IN

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter from Meridian, Ambetter Health and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Douglas K Rex M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID7719976471

PECOS Enrollment IDI20040507001084

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 14

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385

This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.

526 services523 patients

Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239

This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.

148 services143 patients

Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212

This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.

145 services118 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

97 services80 patients

Removal of large bowel tissue using a flexible endoscope 45390

This procedure, known as a colonoscopy, involves using a flexible endoscope to examine and potentially remove tissue from the large intestine. The endoscope allows the doctor to view the bowel lining directly and remove any abnormal tissue for further analysis.

88 services87 patients

Biopsy of large bowel using a flexible endoscope 45380

A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.

76 services76 patients

Colorectal cancer screening; colonoscopy on individual at high risk G0105

Colorectal cancer screening, specifically a colonoscopy, is a preventive measure for those at high risk. A thin, flexible tube with a camera inspects the colon to spot any abnormal growths. This test helps detect potential issues early, enhancing the effectiveness of treatment.

48 services48 patients

Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43235

This procedure, known as an upper endoscopy, involves inserting a thin, flexible tube with a camera down the throat to examine the esophagus, stomach, and upper small bowel. It helps diagnose conditions like ulcers or inflammation.

33 services32 patients

New patient office or other outpatient visit with straightforward medical decision making, if using time, 15 minutes or more 99202

This service involves an initial visit to the doctor's office or other outpatient setting. It typically lasts between 15-29 minutes. The doctor will review your medical history, conduct a physical examination, and discuss your health concerns. It's a chance to establish your health baseline and address any immediate medical issues.

26 services26 patients

Insertion of guide wire with dilation of esophagus using a flexible endoscope 43248

This is a procedure where a thin tube, called an endoscope, is gently passed through your mouth into your esophagus. A guide wire is then inserted to help widen any narrow areas. This helps improve swallowing and reduce discomfort.

20 services14 patients

Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm 43249

This procedure involves using a flexible tube with a camera, called an endoscope, to gently expand narrowed areas in your esophagus, stomach, or upper small bowel. A small balloon is inflated, making it easier for food and liquid to pass through. It's safe and effective.

19 services19 patients

Removal of polyps or growths of esophagus, stomach, and/or upper small bowel using an endoscope with mechanical snare 43251

This procedure involves the use of a thin, flexible instrument called an endoscope to visualize and remove abnormal growths, known as polyps, from the esophagus, stomach, or upper small bowel. A tool called a mechanical snare is used to safely cut and remove these growths.

13 services12 patients

Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional 99211

This service involves an outpatient visit for established patients who may not need direct interaction with a healthcare professional. It could include reviewing test results, monitoring existing conditions, or adjusting treatment plans. It's typically done remotely, ensuring your comfort and convenience.

11 services11 patients

Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk G0121

Colorectal cancer screening, such as a colonoscopy, is a preventive measure to detect early signs of cancer in the large intestine. For individuals not at high risk, it's typically recommended at age 50. A small, flexible tube with a camera is used to examine your colon. It's a safe, effective way to catch issues early.

11 services11 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Indiana University Health

Acute Care Hospitals · Indianapolis, IN

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number150056

Location1701 N Senate BlvdIndianapolis, IN 46202 · Marion County

Emergency services Birthing friendly

Indiana University Health North Hospital

Acute Care Hospitals · Carmel, IN

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number150161

Location11700 N Meridian StCarmel, IN 46032 · Hamilton County

Emergency services Birthing friendly

Indiana University Health Arnett Hospital

Acute Care Hospitals · Lafayette, IN

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number150173

Location5165 Mccarty LnLafayette, IN 47905 · Tippecanoe County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 46202 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$122.49 typical visit price

range $53.07 – $161.76

Typical copayment $30.62 (range $13.26 – $40.44)

Most-billed visit code 99204

Established Patient

$94.22 typical visit price

range $16.93 – $132.22

Typical copayment $23.55 (range $4.23 – $33.05)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JACK DAVID MARKIEWICZ M.D.

Radiology (Diagnostic Radiology)

550 UNIVERSITY BLVD
INDIANAPOLIS, IN 46202

Marion County (317) 278-9729

CRISTINA NANCY PEREZ CHUMBIAUCA MD

Internal Medicine (Rheumatology)

550 UNIVERSITY BLVD
INDIANAPOLIS, IN 46202

Marion County (317) 944-5000

JENNIFER MARIE SPORS NP

Nurse Practitioner (Gerontology)

550 UNIVERSITY BLVD
INDIANAPOLIS, IN 46202

Marion County (317) 944-7728

DR. BRENNA ESPELIEN MD

Obstetrics & Gynecology (Gynecology)

550 UNIVERSITY BLVD
INDIANAPOLIS, IN 46202

Marion County (317) 274-2018

STEVEN T HUGENBERG MD

Internal Medicine (Rheumatology)

550 UNIVERSITY BLVD
INDIANAPOLIS, IN 46202

Marion County (317) 944-8660

OLGA BARKAY MD

Student in an Organized Health Care Education/Training Program

550 UNIVERSITY BLVD, SUITE 4100
INDIANAPOLIS, IN 46202

Marion County (317) 278-0427

DR. YELENA CHERNYAK PH.D., HSPP

Psychologist (Health)

550 UNIVERSITY BLVD, ROOM UH 3240
INDIANAPOLIS, IN 46202

Marion County (317) 944-7422

HEATHER M HOSFIELD NP

Nurse Practitioner (Adult Health)

550 UNIVERSITY BLVD
INDIANAPOLIS, IN 46202

Marion County (317) 944-5000

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Douglas Rex's NPI number?

The NPI number for Douglas Rex is 1164486643. It was assigned to this individual provider in the NPPES registry on April 13, 2006.

Where is Douglas Rex located?

Douglas Rex practices at 550 University Blvd Uh 4100, Indianapolis, IN 46202. The listed phone number is (317) 278-8741.

What is Douglas Rex's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Douglas Rex enrolled in Medicare?

Yes. Douglas Rex is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Douglas Rex accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Anthem Blue Cross and Blue Shield and CareSource and 1 other insurer list Douglas Rex as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Douglas Rex affiliated with any hospitals?

According to CMS data, Douglas Rex is affiliated with Indiana University Health, Indiana University Health North Hospital and Indiana University Health Arnett Hospital.

When was this NPI record last updated?

The NPPES record for Douglas Rex was last updated on March 4, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.